tell us more about guzman and why this arrest is so significant. >> reporter: guzman is considered by drug agents around the world to be the most powerful drug trafficker in the world. he headed the sinaloa drug cartel, mexico's largest cartel. the biggest supplier of drugs to the united states, methamphetamine, heroin, cocaine and marijuana. it was a violent cartel, a strong cartel that took over smuggling routes into the united states over the last few years in a very bloody way. guzman is reputed to be at the very top of all that. so his capture is seen as a very big deal in mexico and in the united states. it's tantamount to the killing of pablo escobar in colombia, even the killing of osama bin laden in the war on terror. to the mexicans, this guy was number one. and he was most wanted by the d.e.a., too, with a $5 million award. this is a huge arrest. we're told by u.s. and mexican authorities that it occurred early this morning. in fact, a mexican senior official just said it happened at 6:40 a.m. in mazatlan. they have officially confirmed they do have in their hands joaquin e